Oracle Database B10772-01 Administrator's Manual page 293

"About Using Shared Schemas for Enterprise User
See Also:
Security" on page 11-19 for more information about creating and
using shared schemas for enterprise users.
How Enterprise Users Access Database Resources with Database Links
Database links are network objects stored in the local database or in the network
definition that identify a remote database, a communication path to that database,
and optionally, a username and password. Once defined, the database link is used
to access the remote database. Oracle Database supports connected user links, fixed
user links, and current user links.
Enterprise users can use all three types of database links. Connected user links are
accessed by a local user who has an account on the remote server. Fixed user links
contain a username and password as part of the link definition. Current user
database links allow enterprise users to access objects on remote databases without
passing authentication information during link execution, or storing authentication
information in the link definition. They require SSL for the database network
connections, which means public key infrastructure (PKI) credentials must be
obtained and maintained for the databases. Current user database links can be used
to connect to the remote database only as an enterprise user.
See Also:
"About Using Current User Database Links for Enterprise User
Security"
and using current user database links.
Oracle Database Administrator's Guide for information about all
of the different types of database links supported by Oracle
Database
How Enterprise Users Are Authenticated
Enterprise User Security supports the following authentication methods:
Password-based authentication
SSL-based authentication
Kerberos-based authentication
Each authentication method has advantages and disadvantages.
summarizes the criteria for selecting which authentication method is best for your
Enterprise User Security implementation.
on page 11-23 for detailed information about creating
Getting Started with Enterprise User Security 11-9
Introduction to Enterprise User Security
Table 11–1